forked from centrifuge/go-substrate-rpc-client
-
Notifications
You must be signed in to change notification settings - Fork 0
/
codec.go
125 lines (107 loc) · 3.43 KB
/
codec.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
// Go Substrate RPC Client (GSRPC) provides APIs and types around Polkadot and any Substrate-based chain RPC calls
//
// Copyright 2019 Centrifuge GmbH
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package codec
import (
"bytes"
"encoding/hex"
"fmt"
"reflect"
"strings"
"github.com/glant509/go-substrate-rpc-client/v4/scale"
)
// Hexer interface is implemented by any type that has a Hex() function returning a string
type Hexer interface {
Hex() string
}
// Encode encodes `value` with the scale codec with passed EncoderOptions, returning []byte
func Encode(value interface{}) ([]byte, error) {
var buffer = bytes.Buffer{}
err := scale.NewEncoder(&buffer).Encode(value)
if err != nil {
return buffer.Bytes(), err
}
return buffer.Bytes(), nil
}
// EncodeToHex encodes `value` with the scale codec, returning a hex string (prefixed by 0x)
func EncodeToHex(value interface{}) (string, error) {
bz, err := Encode(value)
if err != nil {
return "", err
}
return fmt.Sprintf("%#x", bz), nil
}
// Decode decodes `bz` with the scale codec into `target`. `target` should be a pointer.
func Decode(bz []byte, target interface{}) error {
return scale.NewDecoder(bytes.NewReader(bz)).Decode(target)
}
// DecodeFromHex decodes `str` with the scale codec into `target`. `target` should be a pointer.
func DecodeFromHex(str string, target interface{}) error {
bz, err := HexDecodeString(str)
if err != nil {
return err
}
return Decode(bz, target)
}
// EncodedLength returns the length of the value when encoded as a byte array
func EncodedLength(value interface{}) (int, error) {
var buffer = bytes.Buffer{}
err := scale.NewEncoder(&buffer).Encode(value)
if err != nil {
return 0, err
}
return buffer.Len(), nil
}
// Eq compares the value of the input to see if there is a match
func Eq(one, other interface{}) bool {
return reflect.DeepEqual(one, other)
}
// HexDecodeString decodes bytes from a hex string. Contrary to hex.DecodeString, this function does not error if "0x"
// is prefixed, and adds an extra 0 if the hex string has an odd length.
func HexDecodeString(s string) ([]byte, error) {
s = strings.TrimPrefix(s, "0x")
if len(s)%2 != 0 {
s = "0" + s
}
b, err := hex.DecodeString(s)
if err != nil {
return nil, err
}
return b, nil
}
// MustHexDecodeString panics if str cannot be decoded
func MustHexDecodeString(str string) []byte {
bz, err := HexDecodeString(str)
if err != nil {
panic(err)
}
return bz
}
// HexEncodeToString encodes bytes to a hex string. Contrary to hex.EncodeToString,
// this function prefixes the hex string with "0x"
func HexEncodeToString(b []byte) string {
return "0x" + hex.EncodeToString(b)
}
// Hex returns a hex string representation of the value (not of the encoded value)
func Hex(value interface{}) (string, error) {
switch v := value.(type) {
case Hexer:
return v.Hex(), nil
case []byte:
return fmt.Sprintf("%#x", v), nil
default:
return "", fmt.Errorf("does not support %T", v)
}
}